Sewing-machine.



I G. P. GRAY.

SEWING MACHINE.

APPLIUATIOI rILmJ JUNE 24, 1910.

1,008,538. Patented N o 14,1911.

WITNESSES: INK 'NTOR A TTORNEY UNITED sTArgs PATENT OFFICE.

CHARLES F. GRAY, OF SIERRA MADRE, CALIFORNIA, ASSIGNOB TO TE 5 SINGER H A NU- FACTURING COMPANY, A CORPORATION 01' NEW JERSEY.

SEWIZtlG-MAGHINE;

Specificationof Letters Patent. Patentad Nov. 14, 1911.

Application filed June 24, 1910. Serial No. season.

To all whom it may concern:

Beit known that I, CHARLES F. GRAY, a citizen of the United States, residing at Sierra Madre, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference being bad therein to t e accompanying drawings.

This invention has for its object to im-' prove that class of sewing machines wherein a loop-taker engages a loop of needle thread and, without passing) through it, casts said loop about a cop or obbin of under thread held in a non-rotatable bobbin case, which latter is mounted in an annular groove in the inner wall of the. flange forming the cast-off portion of the loop-taker, as is-represented by U. S. Patent to W. F. Dial, No. 480,181, dated August 2, 1892, and the present description will be confined as much as possible to .the new parts employed.

In earlier devices of the character above referred to, there is formed in the inner wall of the flange of the loop-taker an annular groove which extends-from slightly back of the loo -receiving point to the heel of said loop-ta er, said groove receivim an annular projection which is formed on the periphery of the bobbin case; and for the purpose of retaining the needle thread while it is being cast about'the mass of under thread by the action of the loop-taker and to provide for the escape of the needle thread loop from the rear of said bobbin-case when it is acted upon by the take-up, said projection is cut away from a portion of the periphery of said case; and on account of said projection per-- forming the function of retaining the needle thread while it is being acted upon by the loop-taker, it is essential that its coacting guide-ways be located at or near the bottom wall of the loop-taker in machines which employ cops or bobbins of the usual commercial capacity, the extent of the cut out portion of the extension being governed by the demands of the needle threadloop afterit has been entered by the point of the loo taker and the time of its escape from t e rear of the bobbin case.

To better adapt the under stitch-forminmechanism for use in connection with hig speed sewin machines, applicant has provided the hoe flange with a. groove of suflicient width. to bring its o'lter Wall close to the outer edge of said flan; go, and has added to the bobbin case a coactir projection, correspondingl located, Whlil creases the earin surfac s of the coacting guiding elements, essens t 1e liabilit of excessive friction between said e ements through the action of the take-u taker, bobbin case and bob bin, assembled in stitch-forming relationship, together with the bracket in which said loop-taker .is

mounted. Fig. 2 is a pe1 s ective viewcf the bobbin case and its att |.c ed thread tension splring. Fig. 3 is a p( rspective view of the bo bin case, its axialF; osltion being opposite to that shown in ig. 2. Fig. 4 is a perspective view of the hop-taker, the removable flange section beiJ 1g omitted. Fig. 5 is a perspective of the fle nge section omitted in Fig. 4. Fig. 6 is a oerspective of the on the. sewing threads, especially when tightening materially .in-

screw for securing to the loop-taker the removable flange section. F g. 7 is a perspective of the bobbin for sup plying the under thread. Fig. 8 illustrates a. development of the periphery of the bobb in case shown in Figs. 2 and 3. Fig. '9 illu. :trates a development of the inner wall (f the flange.

1 represents a loop-take] bracket of ordinary construction provided for the reception of the loop-taker shait 3 and havin 1 bearing surface2for attacling said brac et to the underside of the sew in machinebedF plate (not shown), said 81 m t being operatively connected with the actuating mechaloop-taker nism of the sewing machine throughcommonly mployed connectio 1s.

4 represents the bottom wall of the loop F and screw opening 8, sail notch enacting with a pin 9 and said scre v opening receiving the screw 10 which is threaded into opening 11 formed in the loop-taker base 12 for securing-said section to said base. on the inner walls of the sections 5 and 6 is formed a groove or race-way for the reception of the projections or guide-ways 13 and 14 formed on the periphery of the bobbin case, said groove or race-way being provided with a concaved portion 15, inner uide walls 16 and 17 and like outer guide we. ls 18 and 19, said groove extending from near the free end of the loop-receiving element 20 to the heel 21, as shown in Fig. 9. The guide walls 16 and 17 co'act with the walls 22 and 23, respectivel of the projection 14, and the guide wal s 18 and 19 coaet with the walls 26 and 27, respectively, of the projection 13, the section 5 being made-removable to accommodate the suspension of the bobbin case within the groove in the loop-taker.

In the present construction, as in earlier devices, the bobbin-case is provided with a central hub or stud 28, for the reception of the bobbin 29.

By reference to Fig. 8 it will be seen that the end 30 of the pro ection 13 slightly overlaps the end 31 of the projection 14, and that the oppositely arranged end 32 of said projection 13 overla s the end 33 of the projection 14 for a su stantial distance, such increase in 1 bearing surfaces being made practicable through the angle given the loop of the needle thread, with relation to the line of needle actuation, at the time said loop is passin from the point 34 to the throat 35 of tie loop-taker, durin which time, as is well understood, the need e thread loop rides the inclined ortion 36 of the loop receiving element 20, us causin portion of said loop to be carrie in the direction of the movement of the loop-taker, which results in givin to said loop an angular relationship with respect to the line of needle actuation. The re ationship of the end 32 of the projection 13 with respect to the end 33 of the projection 14' is governed by the action of the take-up when with drawing the thread loop out of jth'e'poeket formed by .the bottom wall 4 of. the looptaker and the rear wall of the bobbin-case.

- It will be evident that the thread loo must first pass out through the opening ormed -in the projection -14 and later between the ends 30 and .32 of the projection .13, and it is the difference betweenthe time of withdrawa-l of the thread loo out frombetw'een the ends 31 and 33 an the time when it passes from between the ends 30 and 32 that s psrmits of an increased length of bearin 60 taker, thus minimizing the liability of wear the lower its impasse and effecting a relationship of said coacting bearings which reduces the liability of the bearin s carried by the bobbin-case tipping and. binding in the groove formed in the loop-taker, as is the usual condition after comparatively limitedusc when bearings of substantially narrow proportions are emloyed, and especially is this true if the hearing carried y thebobbin-case be located at one side of its median plane, as has been the form of construction employed prior to the present invention.

Referrin more particularly to Figs. 8 and 9, it is evi ent that the projections 13 and 14 could consist of a single hearing, but by constructing them as herein only is the weight of the obbin-case reduced, but convenient means are provided for tensioning and guiding the lower or bobbin thread as it is consumed in the sew- .ing operation. The bobbin-case thread tension spring 37 is secured by screw 38 to the bobbin-case and provided with a tension regulating screw 39 which passes through a suitable opening (not shown) formed in said spring and is threaded into said case. 40 represents a thread-guiding slot extending from the outer edge of the bobbin-case to the circular opening 41, which latter is located beneath the free end 42 of the spring 37 and acts to guide the bobbin thread beneath said spring, from which position it is passed through the opening 43 formed in the wing 44 of said case and guided to the action of the stitch-forming mechanismthrough the groove 45. 'The throat of the loop-taker is so shaped that immediately after the loop has been taken by the point 34 it is elongated and its lower portion is drawn far-enough toward the center of the loop-taker to place it in line with the end 31 of the projection 14; and in the further rotation of the loop taker the end 31 retains .wall of the loop-taker, in the manner point-' ed out. in the patent previously referred to.

Glaims: a p

1. In a sewing machine, a loop-taker 'for casting the loop of needle thread about the mass of under thread and provided with a two-part peri heral guide flange and, a ve, in com ination with a non-rotatable bbin-case provided with a bobbin whose axis of rotation is parallel with the axis of said'loop-taker, said bobbin-case havin on eriphery -a guide-way whose gui ing su aces terminate at dilferent points in the periphery of said bobbin-case, said guideway eoactin' with the ove formed in said flange to ho (1 said bo in-case in operative relationship with said loop-taker, the guide wallsof'saldguide-way lying in planespar- I omted out not plane of sa1d b0 bin-case.

allel with the plane of said bobbin case being located on opposite sides of the median plane of said bobbin-case.

2. In a sewing machine, a loop-taker for casting the loop ofneedle thread about the mass of under thread and provided with a two-part peri heral guide flange and, aroove, in com ination with a non-rotatable bobbin-case provided with a bobbin whose axis of rotation is parallel with the axis of said loop-taker, said bobbin-case having on its periphery a guide-way divided in the direction of its length which coacts with the groove formed in said flange to hold said bobbin-case in operative re ationship with said loop-taker, the guide walls of said guidewva) lying in planes arallel with the bobbin-case lieing located on op osite sides'of the median plane of said 3. In a sewing machine, a loop-taker comprising a sectionally -formed peripheral ange for casting the loop of needle thread about the mass of under thread and provided with a groove having a concaved central portion extending in the direction of the length of said groove, in combination with a non-rotatable bobbin-case having on itsperiphery a guide-way which coacts wit-h the groove formed in said flange to hold said bobbin-case in operative relationship with said loop-taker, the guide walls of said guide-way lying in planes parallel with the plane of said bobbin-case being located on op osite sides of the medianplane of said bo bin-case.

4. In a sewing machine, a loop-taker comprising a sectionally formed peripheral flange for casting the loop of needle thread about the mass of under thread and provided with a groove having a concaved central portion extending "in the direction of the length of said groove, in combination with a. non-rotatable bobbin-case having on its periphery a guide-way divided in the direction of its length and coacting with the groove formed insaid flange to hold said bobbin-case in operative relationship with v plane 1 non-rotatable said loop-taker, the guide walls of said guide-way lying in planes )arallel with the of said bobbin-case )ein located on op osite sides of the medi LIl p ane of said bo bin-case. 1

5. In a sewing machine, loop-taker comprising a. sectionally-foi med peripheral ange for casting the loop of needle thread about the mass of under thread and provided with a ve, in co: nbination with a bbin-case having on its periphery a gaide-wa divi ed in the direction of its len th and c1 acting with the groove formed in said fla ige' to hold said obbin-case in operative 2e ationship with said loop-taker, a thread tension sprin mounted within the outer walls of sai guide-way, and openings it said case for the passage of the bobbin thr ead beneath said spring. I

6. n. a sewing machine, 1 looptaker comprising a sect-ionally-formed ripheral ange for casting the loop of nee le thread about the mass of under thread and provided with a groove, in co mbination with a non-rotatable bobbin-case .iavin on its periphery a guide-way dividl d in t e direction of its length and coacting with the groove formed in said flange to hold said bobbin case in operative relatic nship with said loop-taker, said case being provided with a thread tension spring mounted within the outer wallsof said guidevay, a thread slot leading inward from the mter face of said case, a wing carried by Slld case and provided with a thread 0 enir g connecting with said thread slot, an a thread groove extending from said thread opening 'for aiding the under thread to the action 0 the stitch-forming mechanism 7 In testimony whereof, E have signed my name to this specification, in the presence of two subscribing witnesses.

CHAR LES F. GRAY.

Witnesses:

J. D. Maoxnnnas, 1 A. S. MEAD. 

